Control of silver-polymer aggregation mechanism by primary particle spatial correlations in dynamic fractal-like geometry.
Nanoscale
; 3(9): 3774-9, 2011 Sep 01.
Article
em En
| MEDLINE
| ID: mdl-21826362
ABSTRACT
Silver nanocrystals have been prepared by reacting silver nitrate with ascorbic acid in aqueous solution containing a low concentration of a commercial polynaphthalene sulfonate polymer (Daxad 19). Various crystalline morphologies have been obtained simply by tuning the reaction temperature. We have investigated the nanoparticle formation mechanism at three different temperatures by in situ and time resolved small angle X-ray scattering measurements. By modeling the scattering intensity with interacting spherical particles in a fractal-like polymer-Ag matrix, we found signatures of nucleation, growth and assembly of primary particles of about 15-20 nm. We observed how the time evolution of both spatial correlations between primary particles and the dynamic fractal geometry of the polymer-Ag matrix could influence and determine both the aggregation mechanism and the morphology of forming nanostructures in solution.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Polímeros
/
Prata
/
Nanopartículas Metálicas
Idioma:
En
Revista:
Nanoscale
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Itália